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Note 13 - Earnings Per Share - Calculation for Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net income $ 6,418 $ 6,255 $ 12,620 $ 12,339
Dividends on preferred stock
Net income available to common shareholders $ 6,418 $ 6,255 $ 12,620 $ 12,339
Weighted average common shares outstanding, basic (in shares) 17,012,189 17,414,320 17,005,196 17,636,783
Total dilutive effect of potential common shares (in shares) 70,643 48,525 70,765 38,345
Weighted average common shares outstanding, diluted (in shares) 17,082,832 17,462,845 17,075,961 17,675,128
Basic (in dollars per share) $ 0.38 $ 0.36 $ 0.74 $ 0.70
Diluted (in dollars per share) $ 0.38 $ 0.36 $ 0.74 $ 0.70
Stock options (in shares) 76,868 130,165 63,038 147,713
Total potential antidilutive shares (in shares) 76,868 130,165 63,038 147,713
Employee Stock Option [Member]        
Stock attributable to share based compensation (in shares) 47,591 32,365 50,356 29,605
Stock options (in shares) 71,592 130,165 59,473 147,713
Total potential antidilutive shares (in shares) 71,592 130,165 59,473 147,713
Restricted Stock [Member]        
Stock attributable to share based compensation (in shares) 23,052 16,160 20,409 8,740
Stock options (in shares) 5,276 3,565
Total potential antidilutive shares (in shares) 5,276 3,565